surfc() not working properly

[xarico10]

When using surfc() to create a three-dimensional surface plot with a contour plot underneath, the contour plot isn't correctly plotted (it should be underneath the 3-D surface on its same grid, not all over the place with independent grid and axes).

[X,Y] = meshgrid(1:0.5:10,1:20);
Z = sin(X) + cos(Y);
surfc(X,Y,Z)

fig2plotly(gcf, 'offline', false);

Expected and generated (https://chart-studio.plotly.com/~xarico10/755/#/) plots:

Examples on using surfc() can be found on:
https://www.mathworks.com/help/matlab/ref/surfc.html

[jackparmer]

@empet made a nice solution for this in Python

[jackparmer]

Here are some examples:

https://chart-studio.plotly.com/~empet/15742/#/

https://chart-studio.plotly.com/~empet/14225/slices-in-volumetric-data/#/

@empet I couldn't find your notebook for making these projections from 3d surface plots

[empet]

@jackparmer
These are the two notebooks that illustrate projections onto a z-plane:

https://chart-studio.plotly.com/~empet/15919
https://chart-studio.plotly.com/~empet/15918

[gilbertogalvis]

PR #347 fix this issue